Dropped ceilings
Sagging ceiling repairs across Sydney, assessed before anything is refixed
A ceiling that has dropped, bulged or pulled away at one edge has stopped being held. We work out what let go, then whether it can be refixed or has to come down.
Plasterboard is held up by its fixings, not by the compound on the surface. When a ceiling starts to drop, the screws or nails have pulled through the face paper, the adhesive dabs have released from the joists, or the board itself has lost the strength to span between the battens.
So the first question is never how to fill the gap along the cornice. It is how far the sheet has moved, how much of it is still properly attached, and whether the board is sound enough to be pulled back and fixed again. That answer decides the job and it decides the number.
- Safety looked at first
- Refix, piece in or re-sheet
- Set back to one flat plane
Safety before tidiness
A loaded ceiling that is still moving is a weight problem first. Keeping people out from under it comes before any quote.
We find what let go
Screws through the paper, glue off the joist, or board that has lost its strength. Three failures, three different repairs.
Refix where refixing holds
A sound sheet that has only lost its fixings does not need replacing, and we will not sell you a replacement it does not need.
Re-sheeted properly when it must be
When the board has given up it comes down in a controlled way, new sheet goes back to the frame and the cornice line is put back.
A ceiling that is dropping is carrying a load
A sheet of plasterboard is heavier than most people expect, and a ceiling that has let go is usually holding insulation and dust as well, sometimes stored boxes and occasionally water. If a ceiling is visibly bulging, hanging below the cornice, or has opened a gap along one wall, treat the room as out of use.
Do not push it back up, do not put a screw through it to see if it holds, and do not drill it to let water out unless you know what is above it. Each of those moves the load somewhere less predictable. If nobody can look at it that day, shut the door.
Read the shape
How far has the sheet actually moved?
Sag is a range, not one condition. A shallow dish you only notice in raking light and a sheet hanging clear of the cornice are the same word describing very different jobs. These six cover almost everything we get called to.
A shallow dish between the battens
Flat straight on, dipping slightly in raking light, and it gives a little when pressed. The fixings usually still hold at the battens and the board has lost stiffness in between. Cheapest stage to deal with.
The sheet hanging below the cornice line
A shadow gap has opened where the ceiling meets the cornice, widest in the middle of the run. The cornice is still fixed to the wall and the sheet has come away from it. A fixing failure along an edge.
Screw heads in dimples with the board low between them
Each fixing is still in timber but the head has punched through the face paper, so the board hangs off the screw instead of sitting tight to the batten. Refixing beside each one is the repair, not filling dimples.
A drummy hollow area with no fixings in it
Common where the sheet was glued to the joists with dabs and only screwed at the perimeter. The dabs have released and the middle of the sheet has nothing holding it. It sounds hollow and moves as one panel.
A corner dropped with an open joint above it
One edge has come away far enough that the joist or batten line is visible. The remaining fixings are now taking load they were never sharing, and the honest answer is usually a controlled take down rather than a save.
Sag with a tide mark around it
A brown or grey ring with a defined edge, or board that crumbles at the corner, means water has been through the gypsum core. That is water-damaged ceiling work, where board is replaced rather than refixed.
Who should look at it
Plastering work, or something to sort out first
Most sagging ceilings are a plastering job and nothing more. A few are a symptom of something above the ceiling, and refixing those buys you a season. It costs nothing to know which side of the line you are on.
Ordinary sagging ceiling work
- One room or one sheet that has dropped, with the rest of the ceiling sound
- Fixings that have pulled through the paper along a batten line
- Adhesive dabs that have released in the middle of a sheet
- Sag under a sheet fixed at too wide a spacing when the house was built
- Sag after insulation was walked on or batts were dropped hard between joists
Get this understood before plaster
- A ceiling that is wet, still staining, or sagging under a leak nobody has stopped
- Sag across several rooms at once, with cracking opening at the wall junctions too
- Sag that appeared after a storm, along with a lifted roof sheet or a displaced tile
- Sag with doors or windows binding at the same time, which points at frame movement
- A sprayed or textured coating that has not been identified, which belongs on vermiculite and textured ceilings
The decision
Refix it, piece it in, or take the ceiling down
There are three honest outcomes and the assessment picks one. The deciding factor is the condition of the board, not how bad the sag looks from the floor. A badly dropped sheet in good board can be saved. A gentle dish in board that has been wet cannot.
- Refix the existing sheet. The board is dry, firm at the edges and still flat in plane. It gets pushed back against the frame and fixed on a proper pattern into the battens or joists, with wider fixings where old holes have failed, then the heads are spotted and set.
- Reinforce the perimeter first. Where the sag runs along a cornice or a wall, the sheet edge often has nothing solid to catch. A noggin or batten goes in above the ceiling, the sheet is fixed back to it, and the cornice junction is re-set.
- Piece in the failed section. One sheet has gone and the rest is fine. That piece is cut out on the joist lines, new board goes back to the frame, the joins are reinforced and the repair is feathered wide enough to disappear.
- Re-sheet the room. The board is soft, previously wet, fixed at a spacing that was never going to hold, or already refixed once and dropped again. Patching that is money spent twice, so it becomes ceiling replacement.
- Or nothing yet. If something live above the ceiling is causing the sag, the useful thing we can do is say so clearly, in writing if you need it for a claim, and come back once it is dealt with.
Scope
What sagging ceiling work covers here
This page owns the dropped sheet: the assessment that decides between saving it and replacing it, and the work that follows either way. Neighbouring problems have their own pages because each needs a different look first.
Part of this job
- Assessment of how far the sheet has moved and what is still holding it
- Checking fixing type, fixing spacing and whether the sheet was glued as well as screwed
- Adding noggins or battens where a sheet edge has nothing to fix to
- Refixing a sound sheet back to the frame and spotting the fixings
- Cutting out and piecing in a failed section on the joist lines
- Controlled take down of a sheet that cannot safely be pulled back up
- Re-setting the cornice junction and the sheet joints, then sanding to one plane
- Removing the debris and leaving the room ready for your painter
Belongs on another page
- Joint cracking, screw pops and access cuts in a ceiling that has not moved, which is ceiling repairs
- Reinstating a ceiling after a leak, which is water-damaged ceilings
- Taking out and re-lining a whole ceiling, which is ceiling replacement
- Bulging or loose wall lining, which is wall plastering and repairs
- Finding and stopping a roof or plumbing leak, which is a roofer or a plumber before us
- Anything structural. A split joist, a sagging beam or a removed wall is for a builder or an engineer
If the assessment says the board has to come down, you get told that before the job is booked rather than halfway through it. A refix we do not believe in is not worth your money.
What is behind it
The failure, and what it means for the board
You can learn most of this from the floor, with a torch held flat against the ceiling and a hand pressed lightly in a few places. The right column is the normal outcome, not a promise about your ceiling.
| What you can see or feel | What has usually let go | What that normally means |
|---|---|---|
| A soft dish between two battens that springs back when pressed | Board has lost stiffness but the fixings still grip at the battens | Refix into the timber, then spot and set the new heads. The sheet usually stays. |
| Screw heads in small dimples, board low between them | The heads have punched through the face paper, so the sheet hangs off the screws | Refix beside each failed fixing, cut out the old head, spot and set flush. |
| A large hollow area that moves as one panel, no fixings in it | Adhesive dabs have released on a glue-and-perimeter-screw ceiling | Screw the sheet back on a full pattern. Glue is not relied on again. |
| Sheet hanging clear of the cornice with a dark gap along the wall | Fixings have failed along a whole edge, which now carries its own weight | Usually a controlled take down of that sheet, plus new edge support. |
| Sag that follows the shape of the insulation or boxes above it | The ceiling is holding a load it was never designed to hold | Take the load off first. A refix under a live load fails in the same place. |
| Sag that has been refixed before and has dropped again | No sound paper left to hold a fixing anywhere near the failures | Replacement. A second refix into tired board is paying twice. |
How it runs
Photos, assessment, make safe, repair, finish
Sag is the one repair where we would rather see it early in person. Photos get you a range. The decision between saving the sheet and replacing it is made under the ceiling, with a hand on the board.
- 01
Send photos and the history
One straight up, one with the light raking across the ceiling, one of the gap at the cornice. Then tell us whether it appeared suddenly or crept up over years, and whether that room has ever had a leak. History shifts the likely answer more than the photo does.
- 02
Assess on site and make the room safe
We press the board in a grid to find where it is still held, check the fixing pattern and the cornice junction, and look above through the manhole where there is one. Anything moving is supported or brought down rather than left to choose its moment.
- 03
Refix, reinforce or re-sheet
Fixings back into timber on a proper pattern, noggins added where an edge has nothing to catch, failed board cut out on the joist lines and new sheet fixed to the frame. Insulation that has been disturbed goes back where it belongs.
- 04
Reinforce the joints and set in coats
Joints taped, fixings spotted, cornice junction re-run, then built up in coats with real drying time between them. Compound shrinks as it dries, which is why the coats cannot be stacked on one day.
- 05
Sand under raking light, then clean up
Checked with the light across the ceiling rather than straight at it, because that is the only way a dish shows. Then the dust is cleaned up and the room handed back flat and ready to paint.
Assessment and make safe Repair and finish
The quote
What changes the cost of a sagging ceiling
Two ceilings with the same amount of sag can be priced very differently. These are the things that actually move the number, roughly in the order they matter.
Whether the board can be saved
The biggest fork in the road. A refix and re-set costs a fraction of a strip out, new sheet, new cornice junction and a skip.
How much of the ceiling is involved
One sheet in a bedroom is a different job from a whole living area, and different again from every ceiling upstairs.
What is above the ceiling
A joist space you can reach through a manhole is straightforward. Packed insulation, cable runs, ducting or a floor above takes longer to work around.
Whether new timber has to go in
Adding noggins so a sheet edge has something to catch means hands-and-knees work in a roof space rather than a trowel job.
Height and access
A 2.4 metre ceiling is a platform job. A stairwell void, a raked ceiling or a double-height room needs staging, and the staging is often the longest part of the day.
The cornice involved
A plain cove at the junction is easy to re-set. A decorative run that has to come off and go back is slow work and belongs with cornice.
Occupancy and disposal
An empty room is quick to protect. A furnished bedroom, a unit under a strata work order or a shop that keeps trading changes how the work is staged and how debris leaves.
Questions
What people ask about a sagging ceiling
The short answers first. If yours is not here, send a photo and ask, because sag is one of those problems where a phone description can point at three different jobs.
Is a sagging ceiling dangerous, or can I leave it for a while?
It depends how far it has gone, and nobody can tell from a photo whether a ceiling is about to let go. A shallow dish that has been there for years is usually stable. A sheet that has dropped clear of the cornice, feels heavy, or has moved in the last few weeks should be treated as a load looking for somewhere to go.
The rule we use: if you would not sit under it with a coffee, do not use the room. Move out what you care about, keep children and pets clear, shut the door and get it looked at. A ceiling coming down is rarely gentle, and it usually takes the light fitting and a lot of dust with it.
Can a sagging ceiling be pushed back up and screwed, or does it have to be replaced?
Often it can be refixed, and where the board is sound that is what we would rather do. The sheet is pushed back tight against the frame and fixed on a proper pattern, the failed fixings come out, and the new heads are spotted and set so the repair disappears.
The board has to earn that. If it has been wet, if the paper is torn out around old fixings, if it has been refixed once before, or if it has sagged far enough to take a permanent curve, pushing it back gives you a flat ceiling for a year or two and the same problem again.
Why has my ceiling started sagging when nothing has happened to it?
Something usually has, it just was not dramatic. The ordinary causes are fixings that were too few or too widely spaced and have slowly worked through the paper, adhesive dabs releasing from the joists after years of seasonal movement, and load added above, such as extra insulation or storage in the roof space.
There is also a group of ceilings where the original construction was simply marginal. Older Sydney houses often have battens at a wider spacing than a modern sheet wants, and nails rather than screws. Those hold for decades and then let go over a couple of summers.
Does the whole ceiling have to come down if only one sheet has dropped?
No, and pulling down a sound ceiling to fix one sheet is waste. A single failed sheet is cut out on the joist lines so the new board has timber to fix to at every edge, new sheet goes in, and the joins are reinforced and set so they read as part of the ceiling.
It gets more involved on a ceiling made up of many separate repairs at slightly different levels. Past a certain number, the flat result comes from skimming the whole plane rather than one more patch, and we will tell you when you are near that point.
My ceiling sagged and there was a leak above it last year. Which job is that?
If water has been through the board, the board has lost strength in the wet area even if it looks dry now, so it is treated as water-damage work rather than a refix. The sequence is different too: the leak has to be confirmed stopped and the space properly dry before board goes back.
That whole sequence sits on water-damaged ceiling repairs. Come here for a dry ceiling that has dropped, go there for a ceiling that dropped because it got wet.
How long will the room be out of action?
For a refix and set, usually two or three short visits across four to seven days. The hands-on work is a matter of hours. The calendar is set by drying time between coats, and pushing that is what makes a repair shrink and show a line later.
A piece-in runs a little longer because there are more joints to build up, and a full re-sheet is a different shape of job again. The room stays usable between visits, just unfinished, and we clean up at the end of each one rather than leaving dust down for a week.
Get it assessed
Send a photo of the sag and tell us its history
Whether it appeared overnight or crept up over ten years tells us more than the picture does. If it needs a look in person before anyone quotes it, we will say so.